The von Mises distribution (also known as the circular normal distribution
or Tikhonov distribution) is a continuous probability distribution on the circle.
It may be thought of as a close approximation to the wrapped normal distribution,
which is the circular analogue of the normal distribution.

The wrapped normal distribution describes the distribution of an angle that
is the result of the addition of many small independent angular deviations, such as
target sensing, or grain orientation in a granular material. The von Mises distribution
is more mathematically tractable than the wrapped normal distribution and is the
preferred distribution for many applications.